Main interface to C code and data
(PHP 7 >= 7.4.0)
简介
Objects of this class are created by the factory methods FFI::cdef(), FFI::load() or FFI::scope(). Defined C variables are made available as properties of the FFI instance, and defined C functions are made available as methods of the FFI instance. Declared C types can be used to create new C data structures using FFI::new() and FFI::type().
FFI definition parsing and shared library loading may take significant time. It is not useful to do it on each HTTP request in a Web environment. However, it is possible to preload FFI definitions and libraries at PHP startup, and to instantiate FFI objects when necessary. Header files may be extended with special FFI_SCOPE defines (e.g. #define FFI_SCOPE "foo"”"; the default scope is "C") and then loaded by FFI::load() during preloading. This leads to the creation of a persistent binding, that will be available to all the following requests through FFI::scope(). Refer to the complete PHP/FFI/preloading example for details.
It is possible to preload more than one C header file into the same scope.
类摘要
Table of Contents
- FFI::addr — Creates an unmanaged pointer to C data
- FFI::alignof — Gets the alignment
- FFI::arrayType — Dynamically constructs a new C array type
- FFI::cast — Performs a C type cast
- FFI::cdef — Creates a new FFI object
- FFI::free — Releases an unmanaged data structure
- FFI::load — Loads C declarations from a C header file
- FFI::memcmp — Compares memory areas
- FFI::memcpy — Copies one memory area to another
- FFI::memset — Fills a memory area
- FFI::new — Creates a C data structure
- FFI::scope — Instantiates an FFI object with C declarations parsed during preloading
- FFI::sizeof — Gets the size of C data or types
- FFI::string — Creates a PHP string from a memory area
- FFI::type — Creates an FFI\CType object from a C declaration
- FFI::typeof — Gets the FFI\CType of FFI\CData
